FIXING OF CYCLE SLIPS IN DUAL-FREQUENCY GPS PHASE OBSERVABLES USING DISCRETE WAVELET

FIXING OF CYCLE SLIPS IN DUAL-FREQUENCY GPS PHASE OBSERVABLES USING DISCRETE WAVELET TRANSFORMS

[ Asghar Rastbood ] - Dept. of Surveying Eng., TABRIZ University

abstract

The occurrence of cycle slips is a major limiting factor for achievement of sub-decimeter accuracy in positioning with GPS (Global Positioning System). In the past, several authors introduced a method based on different combinations of GPS data together with Kalman filter to solve the problem of the cycle slips. In this paper the same philosophy is used but with the discrete wavelet transforms. For experiments we used from imulate artificial cycle slips in real data. Studies show that the selection of a properwavelet basis function is very important problem in wavelet nsforms. Wavelet transforms detect the place of cycle slips very precise special in low noise test quantities